Improvement in valves of steam-engines



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UNITED STATES PATENT OEEICE.

JOHN S. HOWELL, OF PORTSMOUTH, NEW HAMPSHIRE.

Specication forming part of Letters Patent No. 38,746, dated June 2, 1863.

" 0 all whom it may concern.'

Beit known that I, JOHN S. HOWELL, of Portsmouth, in the county of Rockingham and State of New Hampshire, have invented a new, useful, and Improved Balance-Valve for Steam, Water, Gas, &c.; and I do hereby declare that the same is described and represented in the following specification and dra-wings. A

To enable others skilled in the art to make and use my improved valve, I will proceed to describe its construction and operation, referring to the drawings, in which the same letters indicate like part in each of the figures.

Figure l is a section on the line F G, Fig. 2. Fig. 2 is a section on the line D E, Fig. 1. Fig. 3 is a top view of valve; Fig. 4, a bottom view, and Fig. 5 is an end view.

The nature of my invention consists in a combination of exhaust-ports, passages, and valves balanced or nearly balanced, as hereinafter described.

In the accompanying drawings, H is the cylinder of a steam-engine, and I a steamchest arranged on it, with exhaust-ways J J on each side of the chest leading to the exhaust-pipe K, which passes around the cylinder and terminates in the pipe F', Fig. 1. Steam is supplied through the pipe L to the chest I. The opposite sides of this chest ineline a little outward to make the chest and valves A A working in it a little widerat the top than at the bottom to get suincient pressure of steam on the valves to keep them in their seats and make them work steady and prevent any jarring which might otherwise occur. In lthe sides of the chest I there are two steam-ports, B B, opposite to each other near each end and separated from the exhaustports C O, (which are also opposite to each. other,) by the partitions M M, as shown in Fig. 2. The valves A A are made in the form shown in the several figures of the drawings, and perforated for the valve-rod N, upon which they are fastened, and which traverses them in the chest I. The faces P P of each In each face of each valve there is an exhaustchamber, R, (shown in several of the drawings,) which conducts the steam from the steam-portB into the exhaust-port C, as shown in Fig. 2.

I contemplate that my improved valve may be made in parts and connected by screws or otherwise, so that the faces may be moved out to compensate for the wear of the valve-faces or their seats; also, that the sides of the steamchest and the valve may be made exactly parallel, if preferred that way 5 also, that the two valves may be worked to cut oif the steam by using two valve-rods, passing one through the other or otherwise; and by shortening the exhaustway and lengthening the steamway and valve, so as to use one exhaust-port instead of two on each side, a single valve may serve instead of two, and, also, that the valves may be steadied by springs or ways, so as to work with faces exactly parallel instead of inclined.

I believe I have described and represented my improved sliding valve so as to enable any person skilled in the art to make and use it without further invention or experiment.

I will now state what I desire to secure by Letters Patent, to wit: v

In combination with the steam-cylinder H, the exhaust ports (l C and passages J J, steam-chest I, provided with valves A A, bal anced or nearly balanced, as described, and so constructed, arranged, and operated as to supply steam to and exhaust it from each end of the cylinder H, as required.

JOHNT S. HOWELL.

Witnesses:

J. DENNIS, Jr., D. ROWLAND. 

